I have used my airmiles to get me and my family (17 year old girl and 15 year old boy + xx year old wife) to Singapore in August. Only really went to Singapore because of availability of seats and because people say it is worth spending a bit of time there.

I have never been to SE Asia before and would like advise on a good itinerary for the region.

To give a clue of the sort of thing we are looking for.....

Maybe a week in a house on a good beach - not too comercial (a few hours away on a plane perhaps).
Maybe a bit of time being active - What about Borneo monkeys etc.
Maybe some SE Asia temples.

So in otherwise I want have no real idea what would be good

Any help appreciated